Made from tungsten steel and heat-treated, the blade offers high accuracy, smooth cutting operation, good resistance to shock, and excellent toughness. Precision ground for heavy-duty use and capable of being resharpened, these bits can enlarge existing holes with ease and bore any arc of a circle. Features two spurs and two precision-ground cutting edges for long-lasting performance, ideal for drilling holes in any direction and creating arched openings. Individually titanium-coated Forstner bits designed for use on wood, enabling precise flat-bottom holes without chipping in various material thicknesses. Effective depth allows for clean drilling in end grain, thin stock, veneers, and regular stock. The three-teeth cutter head design enhances drilling efficiency, while the curved head facilitates efficient chip removal. Sharp, durable, and strong for reliable performance. Compatible with electric drills (drill not included). Set includes 10 pieces with different diameters: 15mm, 16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 32mm, 35mm, and 50mm. Suitable for use on wood, particle board, plywood, and similar materials. Compatible with hand drills, bench drills, and vertical drilling machines. Color: red + silver. Package includes only the items listed. Note: Lighting and display differences may cause slight color variations. Measurement error allowed within +/- 1-3 cm.